Difference between `gnome-shell --replace` and r in Alt+F2

Question

Does typing r in Enter a Command dialog that appears after Alt+F2 key combination is used do the same thing as opening a terminal and executing gnome-shell --replace &?

Specifically, do they execute the same code "behind the scenes"?

Answer 1

Running r in the "Enter a Command" command dialog that appears after using keybinding Alt + F2 restarts GNOME Shell:

while gnome-shell --replace "replaces the running window manager".

In the first case Gnome Shell is already running. In the second case there may be another window manager running before.